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BBC once again broadcasting on Shortwave to Europe for first time in 14 years

The technical side of broadcasting. Think IBOC is a sham? Talk about it here! How about HDTV? Post DX reports here as well.
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SolarMax
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Re: BBC once again broadcasting on Shortwave to Europe for first time in 14 years

Post by SolarMax » Fri Mar 11, 2022 11:23 pm

innate-in-you wrote:
Fri Mar 11, 2022 10:32 pm
I've also seen the effects of analog television during events of Sporadic-E openings. Signal levels were more stable when a distant TV station was using circular polarization.

Lord knows that FM stations have preferred CP for decades.

I believe that such a signal could result in real improvement.
VHF/UHF FM and TV using CP don't have that pesky ionosphere, bending, flipping and twisting a signal's polarization.
Once off the antenna, after one or two hops up and down through the ionosphere, an HF signal's polarization is randomized, and in fact along its way becomes essentially circularly polarized due to Faraday rotation.
Broadcasters' horizontally polarized HF arrays are steerable, and designed to be aimed to launch at optimum azimuth and elevation, to take advantage of predicted propagation paths at their operating frequencies.



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